EP1304178B1 - Hochleistung-Maschine mit thermischer Kompensation zum programmierten Biegen von Blechen mit konstantem Biegewinkel - Google Patents

Hochleistung-Maschine mit thermischer Kompensation zum programmierten Biegen von Blechen mit konstantem Biegewinkel Download PDF

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Publication number
EP1304178B1
EP1304178B1 EP02079262A EP02079262A EP1304178B1 EP 1304178 B1 EP1304178 B1 EP 1304178B1 EP 02079262 A EP02079262 A EP 02079262A EP 02079262 A EP02079262 A EP 02079262A EP 1304178 B1 EP1304178 B1 EP 1304178B1
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EP
European Patent Office
Prior art keywords
bending
sheet metal
temperature
programmed
high performance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02079262A
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English (en)
French (fr)
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EP1304178A2 (de
EP1304178A3 (de
Inventor
Wolfgang Kunze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Salvagnini Italia SpA
Original Assignee
Salvagnini Italia SpA
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Publication date
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Publication of EP1304178A2 publication Critical patent/EP1304178A2/de
Publication of EP1304178A3 publication Critical patent/EP1304178A3/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/045—With a wiping movement of the bending blade

Definitions

  • This invention refers to a machine for programmed sheet bending of the general type known in the art as panel bender, as such defined in the preamble of claim 1.
  • panel benders are able to automatically move a sheet metal blank on a horizontal surface placed in front of a bending press provided with a bending unit with one or two bending blades, which is able to perform a number of bends of variable size, angle and direction on each side of the blank.
  • the bending press also comprises a fixed counter-blade and a blank-holder of variable size which cooperates with the counter-blade for clamping the blank near the edge to be bent.
  • the bending unit and the blank-holder are activated by controlled hydraulic cylinders.
  • An example of this state of the art is given by the European patent EP-A-0293964. This document discloses the features of the preamble of claim 1.
  • a drawback consists in a slow and progressive variation of the programmed bending angles owing to the thermal expansion of the bending unit cylinders and pistons, which is caused by the progressive heating of the hydraulic oil, up to the work temperature is reached.
  • the object of the present invention is to eliminate this drawback so as to guarantee temperature compensated piston strokes and, consequently, desired constant bending angles.
  • this object is obtained by a sheet metal bending machine with a bending unit moved by hydraulic cylinders with sliding pistons, characterised by a closed loop control system comprising temperature measuring means for measuring the cylinder temperature, position detecting means for detecting the piston position and a control unit for varying the rate of hydraulic fluid fed to the cylinders according to the measured cylinder temperature and the detected piston position.
  • the bending press shown in Fig. 1 comprises a fixed base 1, which supports a counter-blade 2 on which a lateral edge of a sheet metal blank 3 moved by a manipulator (not shown) rests.
  • a blank-holder 4 cooperates with the counter-blade 3 to clamp the sheet metal edge.
  • the blank-holder is attached to the front end of a movable support 5, which has a rear end hinged at 6 on a rear part of the fixed base 1.
  • the support 5 is moved up and down by a plurality of hydraulic cylinders 7 which react on the fixed base 1.
  • a bending unit 8 comprises a common support 9 for two bending blades 10 and 11 which cooperate with the counter-blade 2 to cause up and down bending of the clamped edge of the sheet metal.
  • the bending unit is subjected to combined horizontal and vertical movements by hydraulic actuators formed by hydraulic cylinders 12 interposed between the rear part of the base 1 and a lever 13 having a fixed hinge 14 and a mobile hinge 100, and by further hydraulic cylinders 15 interposed between the blade support 9 and the fixed base 1.
  • Fig. 2 shows a side of the sheet metal 3, which has a bent edge 31 which forms an angle of 90° (for example) with the adjacent horizontal part 32 of the sheet metal.
  • the hydraulic cylinders 12 and 15, each provided with respective sliding pistons 20, 21, are controlled by a closed loop control system such as that shown in Fig. 3, comprising a hydraulic pump 16, a control unit 17 (in particular, a numerical control unit programmed according to a mathematical model of a panel as shown in Fig. 2) for controlling the fluid rate fed by the pump to the cylinders, a temperature measuring device 18 for measuring the temperature of the cylinders 12, 15 and a piston position detecting device 19 (in substance, an encoder) for detecting the position of the pistons 20, 21.
  • a closed loop control system such as that shown in Fig. 3, comprising a hydraulic pump 16, a control unit 17 (in particular, a numerical control unit programmed according to a mathematical model of a panel as shown in Fig. 2) for controlling the fluid rate fed by the pump to the cylinders, a temperature measuring device 18 for measuring the temperature of the cylinders 12, 15 and a piston position detecting device 19 (in substance, an encoder) for detecting the position of the pistons 20, 21.
  • S is the programmed piston stroke
  • P is the piston position corresponding to the programmed piston stroke at a rest temperature
  • P1 is the piston position corresponding to the programmed piston stroke at the work temperature
  • S 1 is the temperature compensated piston stroke which allows the same piston position P at the work temperature.
  • the cylinder temperature is measured at the beginning of each bending cycle of a type of panel .
  • the lengthening of the body of the controlled cylinders causes a variation of the bending angle with respect to the programmed angle because the bending unit, for obvious reasons, feels the above mentioned thermal effect.
  • the hydraulic cylinders 12, 15 are "controlled", that is they are equipped with a device 18 for measuring the temperature of the cylinders and with a device 19 for detecting the position of the pistons included in a closed loop control system.
  • the hydraulic cylinders 12, 15 and pistons 20, 21 suffer the effect of the thermal expansion caused by the heating of the oil whereas the devices for detecting the position of the pistons are substantially insensible to the variations of the temperature.
  • the closed loop control system determines a temperature compensated piston stroke which allows the piston position to remain constant when the temperature varies from the rest value to the work value at the beginning of the bending cycle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Claims (3)

  1. Metallblech-Biegemaschine mit einer Biegeeinheit (8), welche mit Hilfe von Hydraulikzylindern (12, 15) mit Gleitkolben (20, 21) bewegt wird, gekennzeichnet durch ein geschlossenes Regelsystem, welches eine Temperaturmesseinrichtung (18) zum Messen der Zylindertemperatur, eine Positionsdetektiereinrichtung (19) zum Erfassen der Kolbenposition und eine Steuereinheit (17) zum Variieren der Rate des den Zylindern (12, 15) zugeführten Hydraulikfluids nach Maßgabe der gemessenen Zylindertemperatur und der erfaßten Kolbenposition aufweist.
  2. Metallblech-Biegemaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (17) als numerische Steuerung ausgelegt ist.
  3. Metallblech-Biegemaschine nach Anspruch 1, dadurch gekennzeichnet, dass die Steuereinheit (17) nach Maßgabe eines mathematischen Modells einer Platte programmiert ist.
EP02079262A 2001-10-22 2002-10-16 Hochleistung-Maschine mit thermischer Kompensation zum programmierten Biegen von Blechen mit konstantem Biegewinkel Expired - Lifetime EP1304178B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001006860U JP3085503U (ja) 2001-10-22 2001-10-22 プログラム化した一定の曲げ角度でのシート曲げのための温度補償を有する高効率機械
JP2001006860U 2001-10-22

Publications (3)

Publication Number Publication Date
EP1304178A2 EP1304178A2 (de) 2003-04-23
EP1304178A3 EP1304178A3 (de) 2005-04-13
EP1304178B1 true EP1304178B1 (de) 2007-02-07

Family

ID=18874689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02079262A Expired - Lifetime EP1304178B1 (de) 2001-10-22 2002-10-16 Hochleistung-Maschine mit thermischer Kompensation zum programmierten Biegen von Blechen mit konstantem Biegewinkel

Country Status (8)

Country Link
US (1) US20030074942A1 (de)
EP (1) EP1304178B1 (de)
JP (1) JP3085503U (de)
KR (1) KR100880245B1 (de)
CN (1) CN1250356C (de)
CA (1) CA2397358A1 (de)
DE (1) DE60218008T2 (de)
ES (1) ES2279851T3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007008312A1 (de) * 2007-02-16 2008-08-21 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Presse

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4543649A (en) * 1983-10-17 1985-09-24 Teknar, Inc. System for ultrasonically detecting the relative position of a moveable device
US4590784A (en) * 1984-07-27 1986-05-27 Nippon Kokan Kabushiki Kaisha Press brake
JPS61169118A (ja) * 1985-01-22 1986-07-30 Amada Co Ltd プレスブレーキ
IT1204674B (it) * 1987-06-03 1989-03-10 Salvagnini Transferica Spa Macchina piegatrice per fogli di lamiera con premilamiera a compressione uniforme
CN1068253C (zh) * 1994-07-08 2001-07-11 阿曼德有限公司 弯板机
FR2750625B1 (fr) * 1996-07-05 1999-01-29 Jeandeaud Jean Claude Dispositif pour deplacer une partie d'une machine et exercer un effort en fin de course
US6119579A (en) * 1998-03-20 2000-09-19 Caterpillar Inc. Apparatus and method for detecting piston location within a fluid cylinder of a work machine
US6240758B1 (en) * 1999-06-21 2001-06-05 Toyokoki Co., Ltd. Hydraulic machine

Also Published As

Publication number Publication date
DE60218008T2 (de) 2007-06-28
CN1250356C (zh) 2006-04-12
EP1304178A2 (de) 2003-04-23
ES2279851T3 (es) 2007-09-01
JP3085503U (ja) 2002-05-10
DE60218008D1 (de) 2007-03-22
US20030074942A1 (en) 2003-04-24
KR100880245B1 (ko) 2009-01-28
EP1304178A3 (de) 2005-04-13
CA2397358A1 (en) 2003-04-22
KR20030033978A (ko) 2003-05-01
CN1413780A (zh) 2003-04-30

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